SINGAPORE - A Uber price surge during Tuesday evening's SMRT train disruption led many users of the taxi booking app to voice their displeasure on Twitter.

Some complained that they had to pay rocketing fares during the few hours the North-East and East-West lines were down.

Sometimes this meant as much as five to six times the usual fare. Twitter user Bernice Neo (@berniceneo), for instance, claimed she had to fork out $124 for her trip.

"@Uber_SING And I just paid 5x. Could you look into it please? Thx," she wrote.

@Uber_SING And I just paid 5x. Could you look into it please? Thx pic.twitter.com/AbvWIHMJ8Z — Bernice Neo (@berniceneo) July 7, 2015

Another user (@mxhxthxr) said his $20 trip surged to $100.

@frhn @kuekj my brother says uber is 5-6x normal fare, ~85-100. That was 1/2 hour ago. He tried paying but no cars anyway. — Chua Zhihong (@czhihong) July 7, 2015

At 9.20pm, Uber Singapore tweeted: "In light of the recent #MRTbreakdown, we've disabled surge to help commuters get home easily."

The company also replied to concerned users on the social media site, promising to look into their inflated bills.

The latest train disruption, possibly the country's worst yet, could have been caused by a rogue train.

In a statement, the Land Transport Authority said: "A faulty train could have caused the power to trip; arcing was observed on the underside of this train. The power surge caused the protective relays across the entire North South East West Lines network to be activated, leading to a shut-down of power across the two lines."

Train services on the East-West and North-South lines resumed at 9.20pm and 10.35pm respectively, at reduced speeds.