Platform Screen Doors

Product

Platform screen doors · Commons ↗ Report photo

Automatic sliding glass safety barriers sealing the metro platform edge during train boarding and departure.

Door type	Automatic sliding glass passenger barriers
Typical platform height	1100–1200 mm above rail level
Door panel height	1500–2200 mm covering platform edge gap
Overall frame width	Custom to fit platform length; segments 2–5 m
Opening width	Typically 1200–1500 mm train door alignment
Drive motor power	1.5–3 kW
Opening/closing time	3–8 seconds per cycle
Safety sensors	Dual infrared edges on each door, position limit switches
Control protocol	Radio (2.4 GHz) or wired link to train door controller
Synchronisation tolerance	±200 ms between platform and train doors
Glass specification	Laminated safety glass 6–8 mm thick, 100+ dB noise attenuation
Standards	EN 50106 (platform screen doors for metros)
Direct parts	7
Total parts	114
Class	Product

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Overview

Platform screen doors (PSDs) are automatic sliding barriers installed along the metro or rapid-transit platform edge. When the train arrives and stops, the PSDs open in synchronisation with the train doors. When the train is about to depart, the PSDs close, sealing the platform and ensuring no passengers can fall onto the tracks.

How it works

The Frame Assembly is welded to the platform edge. Two sliding glass doors run on overhead rails, their motion driven by a Sliding Motor Drive. The motor turns a timing belt, linked to both door carriages via pulleys, ensuring both doors move in sync.

The Control & Synchronisation System is a safety-rated PLC that communicates with the train's door control system. When the train arrives, the platform control sends an "open" command. The PSD Controller Board energises the motor, and door rollers ride the rails smoothly.

Infrared obstruction sensors on each door edge are monitored continuously. If detected, the door immediately reverses and opens further, preventing entrapment.

Platform Screen Doors parts and their functions

7 top-level parts · 114 parts in total · full bill of materials below

Platform Screen Doors parts diagram: 1 frame assembly, 2 sliding glass door assemblies, 3 sliding motor drive, 4 door rail & guidance, 5 control & synchronisation system, 6 safety sensor package, 7 emergency release mechanism. 114 parts in 7 top-level items. — Platform Screen Doors parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.

#	Part	Qty	What it does
1	Frame Assembly 4 parts	1×	Aluminum frame assembly
2	Sliding Glass Door Assemblies 4 parts	1×	Glazed sliding door units
3	Sliding Motor Drive 4 parts	1×	Motor and transmission
4	Door Rail & Guidance 3 parts	1×	Rail and roller guidance
5	Control & Synchronisation System 3 parts	1×	Synchronisation and interlocks
6	Safety Sensor Package 3 parts	1×	Obstruction and position detection
7	Emergency Release Mechanism 3 parts	1×	Manual emergency access

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Build & assembly graph

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Bill of materials for Platform Screen Doors

7 top-level lines · 49 rows shown · 114 parts total · indented to 3 levels

#	Item / sub-assembly	Part no.	Qty/assy	Ext. qty	Parts	Type
1	Frame Assembly 4 parts	platform-screen-doors-frame-structure	1×	1	19	assembly
1.1	Vertical Post	platform-screen-doors-vertical-post	4×	4	·	part
1.2	Horizontal Rail	platform-screen-doors-horizontal-rail	6×	6	·	part
1.3	Corner Bracket	platform-screen-doors-corner-bracket	8×	8	·	part
1.4	Fastener Set	fastener-set	1×	1	·	part
2	Sliding Glass Door Assemblies 4 parts	platform-screen-doors-door-panels	1×	1	32	assembly
2.1	Door Frame 3 parts	platform-screen-doors-door-frame	2×	2	5	assembly
2.1.1	Door Stile	platform-screen-doors-vertical-stile	2×	4	·	part
2.1.2	Door Rail	platform-screen-doors-horizontal-rail-door	2×	4	·	part
2.1.3	Fastener Set	fastener-set	1×	2	·	part
2.2	Tempered Glass Pane	platform-screen-doors-glass-pane	4×	4	·	part
2.3	Door Roller Carriage 2 parts	platform-screen-doors-door-roller	4×	4	4	assembly
2.3.1	Ball Bearing	ball-bearing	3×	12	·	part
2.3.2	Fastener Set	fastener-set	1×	4	·	part
2.4	Edge Bumper Pad	platform-screen-doors-bumper-pad	2×	2	·	part
3	Sliding Motor Drive 4 parts	platform-screen-doors-drive-unit	1×	1	33	assembly
3.1	Drive Motor 4 parts	platform-screen-doors-drive-motor	1×	1	25	assembly
3.1.1	Stator Assembly 3 parts + deeper ›	stator-assembly	1×	1	3	assembly
3.1.2	Rotor Assembly 4 parts + deeper ›	rotor-assembly	1×	1	19	assembly
3.1.3	Ball Bearing	ball-bearing	2×	2	·	part
3.1.4	Oil Seal	oil-seal	1×	1	·	part
3.2	Reduction Gearbox 4 parts	platform-screen-doors-reduction-gearbox	1×	1	5	assembly
3.2.1	Gearbox Housing	gearbox-housing	1×	1	·	part
3.2.2	Helical Gear Pair	gear-pair	1×	1	·	part
3.2.3	Ball Bearing	ball-bearing	2×	2	·	part
3.2.4	Oil Seal	oil-seal	1×	1	·	part
3.3	Timing Belt	platform-screen-doors-timing-belt	1×	1	·	part
3.4	Timing Pulley	platform-screen-doors-pulley-set	2×	2	·	part
4	Door Rail & Guidance 3 parts	platform-screen-doors-guide-system	1×	1	6	assembly
4.1	Overhead Guide Rail	platform-screen-doors-overhead-rail	1×	1	·	part
4.2	Floor Guide Channel	platform-screen-doors-floor-guide	1×	1	·	part
4.3	Rail Support Bracket	platform-screen-doors-rail-bracket	4×	4	·	part
5	Control & Synchronisation System 3 parts	platform-screen-doors-control-logic	1×	1	15	assembly
5.1	PSD Controller Board 4 parts	platform-screen-doors-psd-controller	1×	1	9	assembly
5.1.1	Bare PCB	pcb-bare	1×	1	·	part
5.1.2	Microcontroller	mcu	1×	1	·	part
5.1.3	SMD Passive (R/C/L)	smd-passives	1×	1	·	part
5.1.4	Connector	connector	6×	6	·	part
5.2	Position Encoder	platform-screen-doors-door-encoder	2×	2	·	part
5.3	Relay	relay	4×	4	·	part
6	Safety Sensor Package 3 parts	platform-screen-doors-safety-sensors	1×	1	6	assembly
6.1	Obstruction Infrared Sensor	platform-screen-doors-obstruction-sensor	2×	2	·	part
6.2	Position Limit Switch	platform-screen-doors-position-switch	2×	2	·	part
6.3	Relay	relay	2×	2	·	part
7	Emergency Release Mechanism 3 parts	platform-screen-doors-emergency-release	1×	1	3	assembly
7.1	Emergency Handle	platform-screen-doors-release-handle	1×	1	·	part
7.2	Release Linkage 1 parts	platform-screen-doors-release-linkage	1×	1	1	assembly
7.2.1	Fastener Set	fastener-set	1×	1	·	part
7.3	Fastener Set	fastener-set	1×	1	·	part

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Sourcing: possible vendors

Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $500k–$60M. How estimates work

Vendor	HQ	Specialty	MOQ	Lead time
🇨🇳CRRC crrcgc.cc ↗	Beijing, CN	Rolling stock & rail systems	made to order	40–72 wks
🇫🇷Alstom alstom.com ↗	Saint-Ouen, FR	Rail rolling stock	made to order	40–72 wks
🇩🇪Siemens Mobility mobility.siemens.com ↗	Munich, DE	Rail systems	made to order	40–72 wks
🇨🇭Stadler Rail stadlerrail.com ↗	Bussnang, CH	Rail rolling stock	made to order	40–72 wks
🇺🇸Wabtec wabteccorp.com ↗	Pittsburgh, US	Rail equipment	made to order	40–72 wks

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