The EBT did it's own experimentation in motorized transport. The M-1 built in 1926-27 was built by the EBT using slimed down Brill motorcar plains and a Brill gasoline engine. It has Westinghouse electricals. Unlike the Geese it is not mechanically driven. M-1 was a stellar success and ran the rest of the years of the EBT carrying passengers and way freight on the days the coal mines were not producing (weekends, holidays and strike days.)
The M-2 was rebuilt from a streetcar body by the ET&WNC by adding a hooded gasoline engine on the front and a connected drivetrain. The EBT bought it and modified it further extending the body over the engine thus making it look more like M-1. M-2, unlike M-1, was a failure and broke down on its first attempt to climb the grade to Broad Top Mountain. It served out its days on the relatively level Shade Gap Branch before being dismantled after about two years.
M-3 was built in 1928 as an inspection/maintnance vehicle and was built in a very goose style out of a 1928 Nash (some sources say it was a Maxwell but is it clearly a Nash now). It even had a bar pilot like the geese it its early years, but that was later removed. The M-3 exists to this day but its engine was reportedly locked up in the early 1960's when it was run without checking the oil.
M-4 through M-7 were diesels brought it after tourist operations began. M-4, M-6 and M-7 are still on site but M-6 (m-6b and M-6b) were sold off.
In addition the EBT had a bus and cargo road division consisting of about a half dozen vehicles at a time. The first batch were lost in the paint shop fire only to be replaced. The bus line was eventually sold, to Trailways I believe. The EBT maintained road trucks as part of the railroad until the end of service. One is still at Rockhill in the Bus Garage.