Since 1946, Bach-Simpson™ has manufactured instrumentation and custom control electronics. Bach-Simpson started as a manufacturer of rugged, mechanical meters and soon became the supplier of choice for electro-mechanical instrumentation that could withstand the harsh conditions found in the rail environment. A division of Webtec.

  • (519) 452-3200
  • (519) 452-3165
  • 109 Meg Drive,
    P.O. Box 5484
    London, Ontario N6A 4L6

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Showing recent results 1 - 8 of 8 products found.

  • Automated Bench Test Equipment (BTE)


    Bach-Simpson Automated Bench Test Equipment (BTE) provides a combination of automatically sequenced and manually selected electrical signal stimulation to an electronic unit under test. The system simulates the normal and threshold operational ranges of each of the inputs and communication channels of the test unit.

  • Doppler Speed Sensor


    Bach-Simpson's™ Doppler Speed Sensor is a reliable and field service proven system with no moving parts. With no connection to the vehicle axle, there is no need for wheel size adjustments to produce a true ground speed signal. The sensor is mounted and wired independently from the truck to simplfy routine truck maintenance tasks. Its ease of application and operational features make this speed sensing system second to none. The sensor is mounted under the vehicle and determines the vehicle speed via a low power microwave signal. This signal is processed to provide an accurate, true ground speed reading. The Doppler Speed Sensor's output is compatible with existing speed indicators and event recorders, making it part of a cost effective system.

  • Event Recorder


    Bach-Simpson™ Event Recorders are engineered for maximum flexibility, meeting your immediate needs while allowing for future expandability. Bach-Simpson Event Recorders are complimented with a Windows® PC software package for service personnel to download and graphically analyze data from the Event Recorder.

  • Digital Speed Indicator


    Microprocessor controlled, this speed indicator provides an accurate speed display at a low cost. Available in both panel and base-mount versions, each maintains the reliability and rugged performance our customers expect from Bach-Simpson™. Both styles of speed indicators are designed for use in railroad locomotives and other rail and transit vehicle applications. Other features include auto display dimming, variable wheel-size selection and programmable input frequencies.

  • Analog Speed Indicator


    This solid state speed indicator maintains a traditional analog presentation, yet incorporates the accuracy of microprocessor control allowing constant display accuracy to be maintained. It is designed for the harsh and rugged environments of locomotives and other rail vehicles. Our analog indicator is interchangeable with the electrical connections and mounting brackets of older analog models, which makes this unit a convenient and economical replacement. Available in base-mount or console mount models. Options available include a wide variety of speed scales, an odometer as well as multiple speed controlled relay outputs.

  • Speed Verifier

    Model 7 Verifier - Bach-Simpson™

    The Model 7 Verifier is a portable unit that provides a quick, accurate and foolproof means of checking and calibrating the operation of speed dependant equipment, such as speed indicators, event recorders, transition controllers etc

  • Isolation Amplifier


    A rugged, solid state device which allows single speed inputs to drive separate electronic, instruments without crosstalk or interference. Impact and water resistant, this product is designed to stand up to the tough railroad environment. Compatible with both passive and active axle alternators, our amplifier removes speed signal distortion and reduces axle alternator loading.

  • Odometer


    The odometer is a non-resettable, electronic device to count and display the total number of miles accumulated (in either direction) by the vehicle. The odometer registers miles to the nearest mile and has eight digits. The odometer receives an electrical signal from a passive speed sensor. The number of teeth on the sensing gear determines the number of pulses per revolution (PPR). The pulse count is accumulated to determine the number of wheel revolutions. The average wheel diameter, 34.5”, is used to calculate the distance. The distance is displayed to the nearest mile. The current input count is saved using FLASH memory to conserve the data when the system is not powered. The Odometer uses the average (or mid-worn) wheel diameter in its distance calculations. The measurement error introduced with a new wheel (maximum 36”) is compensated by the error with a worn-out wheel (33”). The net result is an accurate mileage total over the life of the sensing wheel.