Hello,
have you considered taking one of the seated drivers in Bachmann's Train Crew set "Bachmann Branchline 36-407 1950s Train Crew x 6" and painting his jacket / upper overalls white?
Once placed in the cab I would wager that the fact the Ice Cream Coat isn't knee length isn't noticable.
By the way, what are you using for a sound chip? I too am looking to fit my Blue Pullman with sound.
Regards,
Richard