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Siemens Mireo
Siemens Mireo
	DB 463 308 of DB Regio operating for the VBB at Falkenberg/Elster in June 2023
Manufacturer	Siemens Mobility at Waggonfabrik Uerdingen, Krefeld, NRW, Germany
Number built	93 (two-car sets) ; 189 (three-car sets) ; 49 (four-car sets)
Predecessor	Siemens Desiro ML
Specifications
Train length	52–140 m (170 ft 7 in – 459 ft 4 in)
Width	2.808 or 3 m (9 ft 2.6 in or 9 ft 10.1 in)
Height	4.208 m (13 ft 9.7 in)
Wheel diameter	New: 880 mm (35 in); Worn: 810 mm (32 in);
Wheelbase	Motor bogie: 2,300 mm (7 ft 7 in); Jacobs bogie: 2,600 mm (8 ft 6 in);
Maximum speed	140 or 160 or 200 km/h (85 or 100 or 125 mph)
Weight	112 t (110 long tons; 123 short tons) (three-car sets)
Axle load	20 t (20 long tons; 22 short tons)
Traction system	Siemens IGBT-VVVF
Power output	2,600 kW (3,500 hp)
Tractive effort	300 kN (67,000 lbf)
Acceleration	around 1.2 m/s (3.9 ft/s)
Electric system(s)	15 kV 16.7 Hz AC from overhead catenary
Current collector(s)	Pantograph (electric)
UIC classification	Bo'2'2'2'Bo' (four-car sets)
Bogies	Siemens SF7500
Safety system(s)	PZB, LZB, ETCS

The Siemens Mireo is a family of electric multiple units (EMU) designed by Siemens Mobility. It is designed to be a successor to the "Mainline" variant of the company's Desiro EMUs.^[2]

The railcars have an articulated design and aluminum carbodies, with 26 meters (85 ft) cab cars on each end of a trainset and 19 meters (62 ft) passenger cars between them, with trainsets between two and seven cars long.^[2] The use of aluminum, combined with new control systems, is intended to reduce energy use by up to 25% compared to previous Siemens EMUs.^[3] The railcars can reach a top speed of up to 160 km/h (100 mph).^[2] Siemens Mobility is currently working on a hydrogen fuel cell prototype.^[4]

Siemens introduced the first Mireo railcars at the 2016 InnoTrans trade fair.^[2] The first units were ordered in February 2017 by DB Regio, which ordered 24 three-car trainsets with a passenger capacity of 220 for service on its routes in the Rhine valley in southwestern Germany.^[3] DB Regio ordered a further 57 three-car high-density sets for S-Bahn service.^[4]^[5] Production of Mireo trainsets began in 2018, with the first completed set unveiled in early December.^[5]^[6] Following testing, Mireo trains are expected to enter revenue service in June 2020.^[6]

Mireo Smart

In November 2020, Siemens unveiled the Mireo Smart. This is a standardized product aiming for attractive pricing and faster delivery.^[7] It includes features such as more advanced CCTV systems, improved passenger information systems, and full testing before delivery.^[8]

Siemens Mobility founded the subsidiary company „Smart Train Lease GmbH“ (STL) in February which allows for near-term leases of Mireo-Smart trainsets.^[9]^[10] The vehicle fleet for the German market will be established during 2024 comprising initially of 12 Mireo Smart, two Plus B and six Plus H. Smart Train Lease expects a common lease to run for one to eight years with a lead time of several months.^[11]

Mireo Plus

The Mireo has two variants to run on unelectrified sections. These can be distinguished by their longer high-floor section at the start of the train (four windows instead of three) where the additional devices are placed underneath. They are in passenger service since 2024.

Mireo Plus H

Siemens and Ballard Power Systems are developing a fuel cell system for the trains, which is expected to be operational in 2021.^[5]

Mireo Plus B

A battery-equipped variant has been developed.^[12] It can run on both electrified lines (taking current from the catenary) and unelectrified lines (using the batteries). It can travel 80 kilometres (50 mi) on unelectrified lines.^[4]

In August 2019, NV Baden-Württemberg [de] ordered 20 battery-electric Mireos. They will be used on the electrified Offenburg - Freudenstadt/Hornberg line (Kinzig Valley Railway) and on several unelectrified lines (Rench Valley Railway, Harmersbach Valley Railway and Acher Valley Railway)

These trains use Lithium-titanate batteries (LTO). Toshiba guaranteed 15,000 cycles at 10C by 2019 and 40,000 cycles at 10C by 2022.^[13] The LTO batteries are replacing prior usage of supercaps in trains to store the energy from braking.^[14]