The Mumbai opener struck 111 as the defending champions, resuming at overnight score of 3 for no loss, reached 221 for three wickets in their second innings in 86 overs at stumps here at the Karnail Singh Stadium.
The visitors, who had posted 361 in the first essay before restricting Railways to 284, clinched two points on the basis of first innings lead whereas their opponents got none.
The day started on a promising note for the home side as first innings centurion Wasim Jaffer returned to the pavilion cheaply.
Jaffer, who had scored an attractive 157 in his earlier knock, was trapped leg before off medium pacer Harvinder Singh after making just 11 with the help of two boundaries.
The dismissal came in the fifth over of the day but that was the lone success Railways tasted in the morning session on a placid track that hardly provided any help to the bowlers.
Mane, seeking to make amends for the failure in the first innings when he made just six, did it in style by holding fort for close to six hours.
After Jaffer's dismissal, the opener was ably supported by Vinit Indulkar who struck a patient 53. The duo added 106 runs in 45 overs for the second wicket before off-spinner Kulamani Parida struck, trapping Indulkar leg before when the team's score was 132.