Used to be you could not work in the same craft once you started to take your pension. Then some leeway was given by different locals when the driver shortage began. Usually the allowable days worked was limited though. In any case, after age 70-1/2 there is no limit since taking pension payments is then mandatory.
You and Wong can work after 70, I'll stay away from the work force till CSPF goes broke and I'll start stealing or selling pencils.