F45 units on Passenger Trains

Some of Santa Fe's  F45's had steam lines but no steam generator, so they could be used as extra power as needed.

Seems to me that much more would would have depended on the units gear ration being capable of passenger train speeds.

The last 20 F45's had steam lines and some had ATS and were geared for 87 MPH.  Got this info from Google.

Santa Fe passed ATS equipment from retired passenger engines to newer ones.  The ATS equipment applied to the last 20 F45's, 5920-5939, could have come from Alco-GE PA1's and EMC E3/E6/E8m engines which were retired just before the F45's appeared.  The actual equipment could have been previously applied to steam engines, Erie-Builts, the DL109, the Budd RDC's, passenger GP7's, GP9's, RS2, RSD5's -- pretty much any predecessor retired passenger engines.  If Santa Fe were still in the passenger business today, the huge stockpile of surplus ATS actuating valves, bells, reservoirs, and relay valves would still be supplying Santa Fe passenger engines. 

When Santa Fe used a pair of F45's on a passenger train, they were originally accompanied by two boiler equipped stainless steel F7B's that had been modified to use potential line control instead of field loop control of dynamic braking, and sanding control from the m-u electrical wiring rather than from the two outside m-u pipes.  If I remember correctly, there were 10 or 12 passenger F7B's modified this way.  After a short period, Topeka Shops furnished enough steam generator cars, built from lightweight baggage cars, to protect the trains powered by F45's, and the modified F7B's went into the secondary passenger power pool, and -- after Amtrak Day -- to freight service in Kansas and Texas.