Thanongsak Pongprasert, an SRT superviser of routes and schedules, said a second-class sleeper for women will be provided on overnight services within 15 days. Children accompanying female passengers will be allowed in the cars, he added.
The no-men-allowed carriages are part of attempts to renew confidence in train passenger services, which include a ban on alcohol sales at stations and on trains from Friday, he said on the SRT Facebook page.
Criticism of the railway service soared after the rape and murder of a 13-year-old girl passenger on southern train bound for Bangkok by an SRT employee on Sunday morning.
SRT governor Prapat Chongsanguan was removed from office by the axed by the junta on Wednesday.
The SRT started random checks on Friday on alcohol and drug use by staff on all rapid and express trains at Hualumphong station, Mr Thanongsak said.
A Lady Car project, with female attendants in the carriages, was first introduced in 2001 on a night express train to Chiang Mai. It was scrapped months later after the SRT said it was not popular with passengers.