Did MTH offer this locomotive in cab number 502? I know they did 500 and 501.
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Looks like they did
Title
20-3042-1
O Scale Premier M-1 Steam Turbine Electric Engine w/Proto-Sounds
M-1 Steam Turbine Electric Engine w/Proto-Soundr - C&O Cab #s 500, 501 & 502
Roadname:
Product Item Number:
20-3042-1
Catalog:
Product Line:
Scale:
- O Scale
Delivery Status:
Delivered FEB. 2000
I looked in my 2000 vol.1 and only found cab#500. Then I found in 2008 the
M-1 Steam Turbine Electric Engine w/Proto-Sound 2.0 Passenger Set - C&O
Cab # 501
Set Includes M-1 Steam Turbine, 4-Car C&O Passenger Set
Roadname:
Product Item Number:
20-3350-1
Catalog:
Product Line:
Scale:
- O Scale
?????????? for Cab # 502. 
The info I posted was from the MTH website w/ a product search for Cab#502. FWIW, I have a 500. Ken has a 501 and I've never personally seen a 502.
