Note: While my name appears in the byline, it should read Brophy/Niedermeyer as Paul made significant contributions and improvements.
The 40′ high-floor coach with large underfloor storage became the standard configuration for practically all modern highway buses. But just who pioneered that? The 1956 Kassbohrer-Eagle was the first production bus of that kind. But there was a precursor to it, the 1954 GM PDX-4901 (“Golden Chariot”), a giant of a bus that GM had high hopes for, but one that was rejected by potential customers and never made it into production. Considering that GM utterly dominated the bus market at the time, and its other buses were copied by everyone else, the failure of the PDX-4901 is an aberration.
The PDX-4901, intended to be called “Super Highway Traveler” in production, is an obvious melding of two of GM’s most legendary intercity coaches; the very successful 35 ft PD 4104 (top) and 40 ft PD 4501 Greyhound Scenicruiser). The PDX-4901 was developed in 1954 with a goal of offering operators other than Greyhound a high-profile 40 ft model equivalent to the Greyhound-exclusive Scenicruiser. Its chassis and drive train were lifted straight from the Scenicruiser, but rather than having a split, bi-level design, it had a single high-level floor.
And when they said high-level, they meant it. The reason for all those steps is because unlike later high-floor buses, the driver sat up at the same level as the the passengers. In all subsequent high floor buses, the driver sits somewhat lower, meaning there are two or three steps up to the initial front level, and perhaps one or two more to get to the main seating area level. Since GM didn’t custom design the 4901 as a high floor bus, but just jacked the whole smaller bus up, this was the result.
Advantages? As you can see, the 4901 had three large luggage bays compared to the two and one-half of the Scenicruiser – more space for bags and packages…a little less distinctive, but more space efficient. And visually imposing, especially for 1954.
GM obviously had high hopes for the Golden Chariot.
And the reason behind the Golden Chariot moniker? GM initially hued the anodized aluminum siding in gold.
Which almost certainly explains the 1956 “Golden Eagle”, the first Kassbohrer-Eagle bus built for Continental Trailways in 1956. The Golden Eagle offered a premium level of service than the subsequent Silver Eagle, and presumably GM had the same thing in mind with its Golden Chariot.
Unfortunately, GM was as hamstrung powering the PD-4901 as it was with the Scenicruiser. Its Detroit Diesel division did not yet have a V8 version of the -71 two-stroke engine family, and the 6-71 was just not powerful enough. So they used the same dual 4-71 engines, driving through a fluid coupling and a three-speed manual transmission with a two speed splitter as did the Scenicruiser. As has been pointed out in several other articles, this power-pack, a compromise at best, had continual teething problems which resulted in significant maintenance downtime – other companies heard of these issues, and as a result, were wary of taking a chance on this coach.
So, as with the Mack MV-620-D, this was a one-off model. GM kept it, then later sold it – and up until the late 1960s, it was in operations (re-engined with the DD 8V-71 as were all of Greyhound’s Scenicruisers) with Aro Coaches, Inc., based in Chatham NJ. As to its current whereabouts, no one knows. It’s a shame that it hasn’t been saved, restored, and offered for exhibition like the MV-620-D. This is actually a more significant coach – while not successful, it was the first, high-level, single floor intercity model – the template in use by every intercity coach today.
GM would stay with the bi-level design with its “Buffalo” series of coaches from 1966-80, but did make one more attempt at a single high floor model in 1977 with the “Triton II” prototype.Unfortunately it was met with the same lack of enthusiasm as the 4901.
And as we’ve mentioned the GM Buffalo, we’ll look at these coaches in an upcoming post.
In new high floor buses, the head of the driver sits roughly at the same level as the passengers’ feet… In that featured coach, driving it must be like driving a COE truck, no??? Below the cockpit of a modern coach, just to illustrate the evolution of ergonomics in long haul coaches
It’s no wonder that people wax nostalgic for the 50s when even something as miserable as bus travel looks appealing because of the iconic bus designs of the day. Back then buses looked like buses. Modern buses look like road trolleys.
In my neck of the woods modern buses don’t look THAT bad… 🙂
With those headlights and side view mirrors, that looks vaguely like a large insect.
But when that face debuted in its predecessor (pictured below), back in 2001 it made a gynormous impact. Long haul coach market was never the same and the coachbuilder threw that face in pretty much everything they designed after ir. I’m sure CCer Johannes recognises both pictured (up and below. The upper one actually has DAF mechanicals)
Damn. You’d need a pickax and pitons to climb that cliff! The entry steps in the SceniCruiser were hard enough for older folks, but these would be physically impossible.
Not nearly as bad as it looks. The driver looks small in comparison to those steps because he’s further away from the camera lens, which is clearly distorting your perception. Their just normal height bus steps, in this case all at once instead of broken up in modern high floor buses. No difference, really.
I like those 1950s era style buses. New ones are boxy and boring. Bus makers should go to retro style buses, as auto makers have done with some cars. There was a 1960s era GM Greyhound I’d also like to see on CC, a smaller version of the so called “Buffalo Bus” and were quite common during my youth.
This is the one I was talking about , which I just found online, a 1964 GM 4106 , an updated 1954 4104. It’s not a smaller version of the “Buffalo” as I thought in my last post.
Hang in there Chris, there’s a post on the GM Buffalo coming up in a few weeks where we mention the 4106. Jim.
Thanks. I love those old Greyhound buses , because they bring back memories of summers with my grandmother , who didn’t drive , but liked to travel…
Why does it say “Scenicruiser Service” on the side of that bus that isn’t a Scenicruiser?
Just my guess but while the Scenecruiser was somewhat of a maintenance headache for Greyhound, it was a brilliant marketing move and a huge publicity success – and the company no doubt concluded it could increase ridership and profits by leveraging the Scencruiser “brand value.” Jim.
Busses sounded like busses back in those days too…..when powered by Detroit 6V71 and 8V71 2 stroke diesels……EPA regulations in the US have forced cleaner 4 cycle design diesels into busses….they don’t have the classic roar of the old 2 strokes.
Had GM stayed with the Triton prototype, they could have even further modernized the exterior design as years had gone by and perhaps add two rear axles the other being a tag axle and smoother side panels. In addition, it wouldn’t be out of GM’s realm to perhaps even add a 45 Foot Version eventually which is currently now a common industry standard. This would ultimately give MCI (now owned by New Flyer Industries) and Prevost (owned by Volvo North American Bus Group) a run for their money.
I agree, the Triton could have made it to the 90’s, and use the B500 transmission and Series 60 engines.
People may say that this bus being modernized Buffalo, but the Classic was a modernized New Look, and it had a B400 with a Series 50 in it’s last years.
Massive and impressive machinery ! Keep them exotics (to my eyes) coming.
Especially when what we had in the 60s was this… Good looking, but totally different (pic from Pinterest)
That “Triton II” looks like someone chopped off the bottom half of a “Silversides” bus and the top half off a RTS and glued them together.
That Triton concept was an attempt to upgrade and modernize the GM PD4905 platform….That model, nicknamed the Buffalo bus was introduced in the mid to late 1960’s and was discontinued after 1980…..GM started backing away from the motorcoach business at that point after dominating the market.
My recollection from driving the PD 4501 as well as the “Buffalo” (in the 60s) is that the Buffalo came out with a 425ci Cat engine.
Ray
GM didn’t back out. They lost Greyhound as a customer…Greyhound had bought Motor Coach Industries,then a Canadian company ,ca. 1960, and originally had it build buses for Greyhound Canada. When GM and Greyhound had their falling out, MCI was ready with new models for Greyhound. These buses developed a reputation for reliability and quality, to the point that MCI got orders from non-Greyhound operators. With the loss of customers, GM decided to exit the over-the-road market in 1980.
The Buffalo bus was discontinued not because GM was backing away from the market but because, being begat from the New Look city/suburban bus, it lost its production facility when GM dropped the New Look for the RTS, which certainly was no boon to GM’s bus business.
That certainly played into it. But sales of the Buffalo had been dropping due to much stronger competition from MCI, Eagle and others. If GM felt the Buffalo still had a substantial future, it could have set up a separate line for it. It was pretty clear that GM was becoming less committed to the coach market.
You have a point…
And a correction to my post; where I wrote “New Look” I should have written,”Fishbowl.” Some sources, notably coachinfo.com, refer to the quad-headlight update of the “Old Look” as “New Look,” but “Fishbowl” is unambiguous.
Ironically, 1954 was the same year the Budd Hi-Level passenger coach was introduced on Santa Fe’s El Capitan (at 1st on a trial basis). With more revenue seats per car (72), & lots of space below as on the bus, it inspired Amtrak’s later Superliners (1st tranche by Pullman-Standard).
There are still Budd rebuild plaques on our old rebuilt Blue Line cars from 30 years ago. The CTA finally put in an order for new cars but they’re all on other lines. Other than being noisy though the old cars aren’t bad. The new cars all have a less seating more standing floorprint.
Thanks for this. I didn’t even know such a thing existed. One more case of a design well ahead of its time.
The “Golden Chariot” PD4901 is alive and well, it’s currently owned by Wilson Bus Lines in MA. It’s part of their Historical Fleet, along with one of the rare surviving Eagle Articulated.
I’m the proud owner of a 53 4104. Number 648.
Runs like a top. Love this ol girl sumthin ferce.