Houston's METRO system already has a few 40 ft New Flyer low floor hybrids. The oldest one is a late 90s model converted into a hybrid, and is the only old model hybrid they operate. The newest ones were received last year.

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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.