MP Karl McCartney is urging people to support a call for more Lincoln to London trains before it is too late.
There are just two daily direct returns to the capital, but the new East Coast Franchise from next December could see extra direct and through trains.
To help make this happen, people can complete and post the form on this page or send views to ICE@dft.gsi.gov.uk before September 18.
Council bosses in Lincolnshire want at least two extra returns a day, and in and ideal world, an early morning arrival from London.
Mr McCartney, MP for Lincoln, said local priorities include a more regular, direct, quicker commutable journey between Lincoln and London, and more connections to the East Coast Mainline for journeys north and south.
He said: "I would like as many people in Lincoln and Lincolnshire as possible to make a submission to the consultation before the September 18 deadline so that we can make clear to the Government the need and demand for more direct trains to and from our capital city.
"The Government intends that the franchise specification should be less prescriptive than previously, allowing bidders greater scope to propose service improvements to meet passenger demand.
"I shall be urging the DfT to continue to work with stakeholders in Lincoln and elsewhere to ensure that local priorities are properly understood and evaluated as the specification for the new franchise is developed."
Emma Tatlow, manager at the Visit Lincoln Partnership, said better rail services are key to the future success of the city's visitor economy.
"In order for Lincoln to grow as a destination, attracting not only leisure visitors but also students and business tourism, it is critical the city is well connected by rail," she said.
"We support additional train services coming into the city and in particular services from London. Transport links are often a barrier when potential visitors are considering where to take a short break, study and hold conferences and events."
Chris Briggs, Lincolnshire County Council's head of transportation, said: "At a recent consultation, the question about Lincoln was raised and the representative from the DfT said Lincoln had been noted, which is good news."
He added that longer trains would not be an issue.
He said: "Trains coming from Leeds would be too long but there are other stations across the country where passengers can't get off on the last two carriages, and we would encourage that."