[2] A large-scale $94 million[3] renovation project restored the former station building, and it reopened in late June 2017 as a regional intermodal transit hub.

Springfield's grand Union Station was constructed in 1926 by the Boston & Albany Railroad to replace an earlier Richardson Romanesque unique dual-station by Shepley, Rutan and Coolidge, the successor firm to that of noted American architect, H. H. Richardson (architect of Trinity Church in Copley Square, Boston).

The New York, New Haven & Hartford (including the Central New England Railway) and Boston & Maine railroads also utilized the station.

As early as the 1950s, the New York Central Railroad, which had operated the Boston & Albany since 1900, considered Union Station "a white elephant" and wanted to sell it.

[9] By February 2016 the parking garage had been assembled and restoration work on the station terminal building had begun, with new windows and roofing installed.

The Federal Railroad Administration denied a waiver from the clearance requirement, preventing the design from being finished before the revitalization of the historic station building itself.

In 2003, a problem pulled the Acela Express trainsets out of service and in an effort to find substitute rolling stock, Amtrak first curtailed the inland round trip to a three-car shuttle between Boston and New Haven before canceling it completely.

One such occasion was the replacement of the Thames River Bridge movable span in June 2008, when Amtrak scheduled three round trips per day over the Inland Route to substitute for the complete suspension of regular Northeast Corridor service.

[citation needed] In 1991, Amtrak extended one daily Atlantic City Express round trip to Springfield, which served other destinations such as Washington, D.C. and Harrisburg.

In September 2019, Amtrak ceased using the Shuttle brand name for the 400 series trains and adopted CTDOT's Hartford Line designation.

The Pioneer Valley Transit Authority, which operates local buses serving Springfield and surrounding towns and cities, occupies 18 bus berths at the station.

[24] This would mark the first Boston-Montreal rail service since the Boston & Maine discontinued the Alouette in 1965, which operated via a direct route through Concord, New Hampshire.

In December 2022, MassDOT along with Amtrak and CSX applied for $108 million in federal transportation money to help fund improvements along the 53 miles of railroad between Springfield and Worcester.

It is planned to add two daily Amtrak trips between Boston, Worcester and Springfield as an interim phase of inland east-west rail service by 2029.

[28] In October 2024, the state was awarded a $36.8 million Federal Railroad Administration grant to support track, signal, and related work at the station.

[29] The Union Station building, bus bays, and parking garage are located on the north side of the rail viaduct adjacent to Frank B. Murray Street.

West of the station, the New Haven–Springfield Line curves to the south while the Berkshire Subdivision continues on to cross the Connecticut River on a twin truss bridge.

Platform D, which serves track 8 and is adjacent to the former 1994 station building, is accessed from the older elevator and stairwell closest to the Lyman Street entrance.

[32] The station offers a Commuter Variety newsstand that sells quick necessities, Dunkin' Donuts and Subway restaurants.

[33] On June 6, 2017, Dietz & Company Architects, the largest architecture firm in the region, announced they would be occupying approximately 8,200 square feet (760 m2) on the second floor.

[34] On November 20, 2017, Peter Pan Bus Lines announced the signing of a lease for 21,000 square feet (2,000 m2) of office space at Union Station for the company's corporate headquarters.