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Model Railroad Infrared Train Detection

If something can be activated with a button, it can be automated with a train detector!

Train Detectors

  • Coded pulsed infrared proximity sensors for detecting model trains on the track.
    • Pulsing (modulation) allows the detector to ignore ambient lighting.
    • Coded pulsing allows each detector to ignore the IR signals of other nearby detectors.
  • May be used as a reflective detector (sensors in the roadbed) or as an interrupt detector (detector looks across the track).
  • On-board LEDs to aid with installation.
  • Relay contact triggers crossing signals, trackside signals, panel lights or action accessories.
  • Automatically switch track power, see the how to automatically stop trains and the collision avoidance at track crossings pages.
  • Sensors can be used with the room lights on or off, they do not require overhead light sources.
  • No rail gaps required, no modifications to rolling stock.
  • Infrared detectors also available with USB computer interface
proximity detector MRD1 - Single & Simple
  • Single position detector, senses a train at one point on the track.
  • Includes optical sensors with 2-ft. wire leads.
  • SPST (form 1A) relay contact output, isolated from detector electronics.
  • Output contact rated for 1/2 A (500 milliamps).
  • To control higher currents, use with an auxiliary power relay
  • Compact size: 2.0 x 1.5 x 0.65 in.
  • Power required: 8 to 15 volts AC or DC, 20 milliamps.
Detector turns on as soon as a train is detected. The drop-out time, that is, how long the detector remains on after the train has passed the sensor, can be set to 1/2 second or 3 seconds by moving a jumper. Longer drop-out delays can be special ordered, [ contact us ].
Installation instructions [pdf]
More installation tips and examples
About relay contact ratings
 
Connect to a 2-aspect signal
Connect to LocoNet™ decoder
Connect to Märklin s88 decoder
drop out delay
Selectable drop-out delay,
1/2 second or 3 seconds
MRD1  $16.95

 
dual IR proximity sensor

More setup and user information
About relay contact ratings

MRD2 - Dual Detector, Multifunction
MRD2-Turnout  $36.50
MRD2-Exhibit  $36.50

 
six channel proximity sensor

Installation instructions [pdf]
More installation tips and examples

MRD6 HexDetex™, Six Channel Detector with crossing signal trigger.
  • Senses model trains at six places on the track.
  • Electronic 5-volt logic outputs.
  • Intelligently switches crossing signals on & off (signals and flasher circuits sold separately).
  • On-board LEDs for easy setup.
  • For details see the installation instructions.
  • Size: 2.5 x 2.35 in. (64 x 60 mm)
  • Power required: 8 to 15 volts AC or DC, 40 milliamps.
MRD6 HexDetex™ with four or six pre-wired infrared sensor sets
Select the number of IR sensors and their wire length.
Two sensor sets with 2-ft (60cm) wire length.
Two sensor sets with 6-ft (180cm) wire length.
Four sensor sets for crossing signal control where only four sensors are needed.
2x 2ft, 2x 6ft.
$53.50
  All six sensor sets with 2-ft (60cm) wire length.
Use when all detection zones are close together.
6 x 2 ft.
$53.50
      Two sensor sets with 2-ft (60cm) wire length.
Four sensor sets with 6-ft (180cm) wire length.
Use when detection zones are widely separated, or for crossing signal control where six sensors per track are needed.
2x 2ft, 4x 6ft.
$59.50

 
octal IR proximity sensor

Installation instructions [pdf]
More installation tips and examples
 
Connect to 2-aspect signals
Connect to LocoNet™ decoder
Connect to Märklin s88 decoder

MRD8, Eight Channel Detector
  • Senses model trains at eight places on the track.
  • Solid state relay outputs for electrical isolation and maximum system compatibility.
  • Eight on-board LEDs for easy setup.
  • Quick-connect terminal blocks.
  • 10-pin ribbon cable connector compatible with RR-CirKits LocoNet Control Point (LNCP)™, Tower Controller (TC-64)™ and similar interface boards.
  • Power required: 8 to 15 volts AC or DC, 40 milliamps.
LocoNet Control Point and Tower Controller are trademarks of RR-CirKits, Waxhaw, NC
MRD8 with eight pre-wired infrared sensor sets
Choose wire length... or use your own sensors
All 8 sensor sets with 2-ft (60cm) wire length.
Use when all detection zones are close together.
8 x 2 ft.
$89.95
  4 sensor sets with 2-ft (60cm) wire length.
4 sensor sets with 6-ft (180cm) wire length.
4x 2ft, 4x 6ft.
$98.95
All 8 sensor sets with 6-ft (180cm) wire length.
Use when detection zones are widely separated.
8x 6ft.
$107.95
  'Barefoot' option -- circuit board only, no IR sensors included. For those who wish to use their own IR LEDs and IR photo receivers. without sensors
$67.50

• Extra sensor sets for use with MRD1, MRD2, MRD6 or MRD8 detector circuits above

two sensor placement
Two sensor sets can be wired to one detector when used in across-the-track configuration. For details [ click here ]
Order extra sensor sets. One set includes one IR LED and one IR phototransistor. Does not include a detector circuit.
Choose lead length

 

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