Detail Tack, from Micro-Mark, item 84774...
....will also work.
Another product by Deluxe Materials is Tacky Wax...
Deluxe Materials is a UK company, but their MANY innovative products for hobbyists....including model railroaders!...are available in the states through several distributors, such as Horizon and Walthers.
FWIW, always...
KD