The 1964 dates are both Race Days - 10th was L/Wt & Junior, while 12th was 50cc/Senior.

However, the helicopter had made its first appearance the year before, and I would think that either an injured rider was so serious as to need the chopper or else he could wait until the roads opened (that is, assuming an ordinary road ambulance couldn't access him).

I think it more likely, especially it being Crosby, that a "civilian" need arose while the roads were closed, and the train, passing as it did under Braddan Bridge, offered the quickest way to Noble's Hospital.

Any further thoughts, Bill?