Just after leaving Bellebat station, the first railroad crossing 

AMTP stands for Association du Musée des Transport de Pithiviers.
This is an association for the preservation of historic rolling stocks of the former Pithiviers - Toury line.
Operating a short part of the historic line, AMTP is based at Pithiviers railway station (maps.app.goo.gl/sKKRXaniAhaiS..., which also houses the museum and the steam and diesel locomotive depot. Regular trains run to Bellebat station, the line's terminus.
More information on timetables : amtp-cfpithiviers.fr
More information on the association : fr.wikipedia.org/wiki/Mus%C3%...