You should be able to access the circuit board and the fan. The fan should have a label on it that states what voltage it runs at.--- probably 12VDC--- find the wires from the fan at the circuit board and apply the voltage that the fan runs at. It should operate, as these fans usually have a failure time of 10,000 hours or more(since they are meant to run continuiosly 24/7). If the fan runs, then something on the control board has gone bad. Finding the bad part may be easy(if it burned up) or impossible. Getting it replaced/repaired may also be impossible, as Lionel most probably has NO spare boards.
HTH---
A Day Without Trains is a Day Wasted
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