In the area of the attack most Allied FBs will be American ones of 9th AF.
You will have to do some more research but here is the story of a P-47 pilot shot down and captured on 14 October 1944 while attacking a train in the same general area:
http://www.co.collin.tx.us/veterans/...s_mcdowell.jsp
McDowell was flying the P-47 42-76219 (see
http://p-47.database.pagesperso-oran...e/42-7xxxx.htm), MACR 9647. The MACR says it was lost in the area coded P-9883 but I have no idea where it is exactly.
On the footnote site, the free view of the MACR allows to see there is a map and a German document in the MACR, the latter giving the crashplace and time usually, but to be able to read them you have to pay.
As a first step you may ask for the following documents:
_ action report of 371st FG
_ MACR 9647