The Moscow Metro will remain open for an extra hour early on Tuesday morning to accommodate those who wish to attend Orthodox Christmas Eve church services.
The metro normally closes at 1 a.m., but passengers will be allowed through the doors until 2 a.m. Tuesday.
Buses, trolleybuses and trams will run until 3 a.m. to help people to get home from late night services, online information portal m24.ru reported.
Almost 7,000 police will be on duty to ensure public safety at Moscow's churches during the celebrations, the report said.