[PatG]

How about a linked campaign? Where in you are given a trains/no trains option right at the beginning dependiong on if the users want to play with my trains or your trucks.

"Kapitaine (sp?) Schwartz, you have just returned to the Eastern front after recuperating from a wound in the Fatherland. As you return to your unit, you have been tasked with assembling other returnees to provide security for supply convoys moving to the front. You can take charge of the train protection group or the truck convoy protection group."

We start him off with a bunch of depleted, low grade or green troops. Then over a number of scenarios, the good Captain gets drafted into full time security duty and gets the option to upgrade and add to his forces.