Silverliner

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Silverliner
A train with Silverliners II through V at Fern Rock
In service	SL-I: 1958-1990 SL-II: 1963-2012 SL-III: 1967-2012 SL-IV: 1973-present SL-V: 2009-present
Manufacturer	SL-I/II: Budd Company SL-III: St. Louis Car Company SL-IV: Avco,[1] General Electric SL-V: Hyundai Rotem
Number built	SL-I: 6 SL-II: 59 SL-III: 20 SL-IV: 232 SL-V: 120
Formation	SL-I/II/III: Single unit SL-IV/V: Married Pair and single unit
Operators	Pennsylvania Railroad Reading Railroad Penn Central Railroad Conrail (under SEPTA) SEPTA US DOT Denver RTD
Lines served	SEPTA Regional Rail
Specifications
Car body construction	Stainless steel
Car length	85 ft
Width	10 feet (3.2 m)
Doors	SL-I/II/III/IV 2 end doors w/ traps SL-V: 3 Quarter point (2+1), two w/ traps
Maximum speed	100 mph (160 km/h)
Traction system	SL-II/III/IV: Transformed alternating current fed initially through Ignitron and later Silicon-controlled rectifiers to phase angle DC motor controller. SL-V: IGBT fed AC Drive.
Electric system(s)	Catenary: 11-13.5 kV 25 Hz AC 12 kV 60 Hz AC (SL-V only) 25 kV 60 Hz AC (SL-V only)
Current collector(s)	Pantograph
Bogies	SL-I/II: Budd Pioneer SL-II/IV/V: General Steel GSI 70
Braking system(s)	Pneumatic, Dynamic (SL-IV/V only)
Coupling system	WABCO Model N-2

Silverliner is the name given to a series of electric multiple unit (EMU) railcars in commuter rail service in the Philadelphia area since 1958. As of the introduction of the Silverliner V in 2009–2010, there have been 5 generations of Silverliner cars, identified by the Roman numerals I through V placed after the name Silverliner. The Silverliner name came from the classes' shiny stainless steel body shell, which contrasted with the painted and frequently rusting carbon steel railcars used by the Pennsylvania and Reading Railroads between 1915 and 1936. Applied to the first large production order in 1963, the cars made such an impression that the name has since been applied to all subsequent MU classes purchased by SEPTA for the Regional Rail services.