I have recently acquired an engine and tender that operates great?? Except the front truck, the pin that holds the wheel on is missing.  But looking on line ( everywhere) I can't find the truck that look like this one.

How do I identify if this is a 2-8-2 or 2-8-4?  It looks like their is a missing rear truck? 
The engine under frame has ( BACHMANN HONG KONG) the road name is A.T. & S.K.
The tender under frame has (BACHMANN  HONG KONG)  with the number 705

Thanks