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Crossrail may be delayed until 2021 due to issues that have emerged with dynamic testing, a source close to the project has told the .

The 拢17.6bn project was due to open last December, but at the end of August 2018 it was revealed that Crossrail was running significantly behind schedule.

In December last year, a month after Mark Wild was named the new chief executive of Crossrail, the scheme鈥檚 co-sponsors said Crossrail would cost up to another 拢2bn to finish, while Wild said he had no idea when the scheme would be finished because there was so much work left to complete.  

Now sources have told the BBC that testing is 鈥減roving more difficult than was first thought鈥�.

The source said: 鈥淚t all depends on how dynamic testing goes between now and the end of this year.鈥�

鈥淭he last quarter of this year will be a critical period for the testing.鈥�

The source said a 鈥渂est case scenario鈥� would see Crossrail open in spring 2020, while a 鈥渕iddle probability case鈥� would be the summer of the same year.

The source said: 鈥淎 worst case is the spring of 2021.鈥�

In a letter sent to London Assembly transport committee chair Caroline Pidgeon earlier this month Wild revealed that close-headway testing 鈥� which tests running trains close together 鈥� had fallen behind.

He said the testing, which was due to start more than three weeks ago on 18 March, had been pushed back until after Easter due to a 鈥渟afety critical failure鈥�. In his letter to Pidgeon, Wild did not spell out what this failure was.

In a statement, Crossrail said London needed the line to be 鈥渃ompleted as quickly as possible and brought into service for passengers鈥�.

鈥淲e are working very hard to finalise our new plan to deliver the opening at the earliest opportunity and we will be providing more details later this month.鈥�