The print management business, which is part of the Lateral Group, will supply timetables, station-specific leaflets and other materials for the South West and East Midlands networks using its cross-media MarketPower procurement and marketing solution.
The company will produce bespoke materials for each station in order to cut down on waste, and will have on-site presence at the head offices of both networks.
The deal was won after a competitive tender, although the company would not disclose the length or value of the contract.
A Stagecoach spokesperson described Dialogue's offering as "streets ahead of its competitors" and said it offered "flexibility and hugely reduces operational costs.
"Not only is this approach cost-effective, but it is also more efficient.
"It is now more crucial than ever for us to invest in profiling, targeting, understanding and servicing our customers."
Stagecoach awards print work for two networks to Lateral's Dialogue business
Stagecoach has awarded a multimillion-pound print management contract to supply tailored material to two rail networks to Dialogue Solutions.