In October 2009, Siemens Mobility started development on a new subway product family.

[3] The company based its design on Modular Metro vehicles previously produced for Vienna, Oslo and Nuremberg.

MVG has designated the trains as Class C2, differentiating them from C1, which wasn't based on Inspiro.

VAG ordered 21 four-carriage trains for the Nuremberg U-Bahn in 2015, designated as G1, with the first entry into revenue service in 2020.

[11][12] Siemens was awarded a contract worth £1.5bn for 94 9-car sets based on the Inspiro to replace the existing 1973 Stock used on the Piccadilly line of the London Underground.