The Yellow Line monorail had its first technical problem after 20 days of trial runs, with five stops temporarily closed for about 90 minutes on Thursday.

The issue occurred at 7am due to an electrical problem, the first since the 23 stations on the line opened on June 19.

Measures were taken to ease congestion at 8.28am and normal operations resumed at 10.15am.

Separately, the Department of Rail Transport (DRT) asked the Eastern Bangkok Monorail (EBM) to increase the frequency of the trains due to the growing number of passengers using the line to get to Lat Phrao station, especially during rush hour.

The number of passengers has gone up since the line's operating hours were extended from 6am to 9pm, from 65,511 people on June 19 to 72,807 on June 20.

To support growing demand, ride frequency should increase from every 10 minutes to every five minutes during rush hours from 7am to 9am and 5pm to 8pm, at least by next week.

The 30.4-kilometre-long Yellow Line is linked with the Green Line at Samrong Station, the Airport Rail Link at Hua Mak Station, and the Blue Line at Lat Phrao Station.