Here’s the audio of a ride on a Septa D40LF on the 57 to Whitman Plaza.
Bus Info: 2005 New Flyer D40LF 8029
This D40LF is powered by a Cummins ISL EPA 04 280 Horsepower Turbocharged Engine with a ZF ECOMAT-6HP-592C Transmission and ride on very loud MAN Axles.