Haflong, May 2: A 30-40m-long crack has been detected on the inside wall of railway tunnel number 10, along the Lumding-Silchar track, in Dima Hasao district following heavy rain over the past fortnight.

All the trains along the route have been cancelled on Tuesday and Wednesday.

When The Telegraph visited the site on Saturday, railway authorities were repairing the crack under the supervision of executive engineer (construction), Northeast Frontier Railway, S.K.Paul. Paul refused to comment on the issue.

The Lumding-Silchar railway track has been closed for the past five days after landslides in Phaiding, between Mahur and Maibang railway stations, and in Harangajao.

The Lumding-Silchar track was converted from metre gauge to broad gauge last year and a goods train service was started on March 25, 2015 and passenger trains started plying on November 21.

Earlier, chief bridge engineer, Northeast Frontier Railway, Alok Kumar Verma, had sent a report to the Lumding divisional railway manager, recommending suspension of passenger trains between New Haflong and Ditokcherra stations because of the poor condition of bridges, tunnels and cuttings.

The 210km Lumding-Silchar track has 79 major bridges, 340 minor bridges and 21 tunnels. There are altogether 33 stations in the section.

Railway authorities have been carrying out repairs on a war footing so that passenger train services can resume as soon as possible.