The "Kaffkieker" tourist trains do offer connecting service on the Hoyaer Railway from Eystrup (at the main line from Bremen to Hannover) to Bruchhausen-Vilsen as well as from Syke (at the main line from Bremen to Osnabrück) by historic diesel motorcar on some sundays.
Additional information about this service, the timetable and fares are presented on the "Kaffkieker" website.