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Of course, Mack was no more a stranger to tracked vehicles than it was to rolling stock.

Note the Mack AC cab, hood and radiator on the 4-ton Mack "Roadless" truck.

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People talk about modern engineering? That was way more sophisticated than any of this garbage we have nowadays.

Exactly. Look at the innovation in that drive system. Can today's engineers do that? So many of today's designs are not all-new, but rather refinements based on the foundation of all-new innovations from previous eras.

The amount of engineering that went into that vehicle just to make a testbed for the desired end user is nuts, there is no company left in the US if not the world htat would go to the trouble to build that, instead they would send you a computer model, oh and charge you for it.

When doing business with the U.S. military in the 50s and 60s, that was the way. And in all fairness, the products that emerged under that system were usually impressive. With today's available research technologies, the design process is now different.

Mack FCD rail buses (light rail cars) still in service decades later with Sperry Rail Service.

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Mack promotional photographs of the first and second generation Mack FCD rail buses (light rail cars).

The Mack Trucks T19

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The Mack TrucksT1 experimental gun motor carriage

(Note the Mack Trucks vehicle identification plate on the right side of the steering column in the second photograph)

The Mack Trucks T3

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Mack Trucks' model 6-CQ-4S hybrid transit bus prototype operated by Public Service Coordinated Transport of New Jersey as unit #3100.