The new range, including sushi, salads, lettuce cups and wraps, offers an "alternative to the traditional lunchtime sandwich".
Asian drummers and flag bearers dressed in Marks & Spencer branded traditional-style costume will alert customers to the new range at five major train station from the end of this month (April).
An additional two days of guerrilla hit-squad activity is planned.
"By targeting busy commuter hotspots we're going straight to the cash- rich, time-poor professional that the Food to Go range is aimed at and showing them that healthy food can be delicious," said Because MD Sharon Richey.
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