Plans for regular direct train services throughout the day between Lincoln and London have been scrapped.
Seven weekday trains in each direction between Lincoln and London's King Cross had been due to start next summer.
But operator East Coast has said that just one service to London in the morning and one returning in the evening will continue to operate.
The train operator said the current economic situation was to blame for the rail service cuts.
Elaine Holt, chairman of East Coast, said efficiencies had to be made in the "very tough economic climate".
She said: "I know this will come as a disappointment to many people, especially to those in Lincoln who were looking forward to a much improved direct service to London."