Yep, for a very short time, Mercedes-Benz buses were operated by Houston METRO. The strange thing is that it was made in Brazil as the Mercedes-Benz O371, and when it got to Houston, it was rebranded as the Stewart & Stevenson Apollo T-40, although I've seen one as a motor home conversion with a big chrome three pointed star on the front, the METRO ones did not have this, only a three pointed star on the steering wheel. Anybody know if these buses used a Mercedes-Benz or Stewart and Stevenson diesel engine? I think it was a diesel powered bus, although it may have been a LNG powered bus. Let me know if you have some knowledge on this, I've been wanting to know about this "confused" MB bus for a very long time.
-Joe
Pic of bus in question

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

In the early 80's Missoula Montana had Mercedes diesel busses - maybe they still do. They were free to ride anywhere and paid for by income taxes.

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1984 300Sd 210k

Former cars:
1984 300D 445k (!!) (Strider) Original (and not rebuilt) engine and transmission. Currently running on V80 ( 80% vegetable oil, 20% petroleum products). Actually not, taking a WVO break.
1993 300d 2.5 275k. Current 120/day commuter
1981 300SD 188k (Hans) Killed by a deer