The Model 1225 and 1250 Readers produce an output for each tag passing in front of one of two antennas. A typical system is configured with two antennas where one faces each side of the railcar. The tagging standard requires two tags per car, with one on the leading right side of the car and one, on the trailing left side. SAI has produced electronic equipment and software which associates the tag information with the appropriate car taking into account the possibility of untagged cars and cars with faulty tags.

SITE LAYOUT CONSIDERATIONS Systems Associates uses the Model 1225 and 1250 Railcar Identification systems on coupled in motion, un-coupled in motion and static scale applications. The layout of the site will determine whether the Model 1225 or Model 1250 is the correct choice. The Model 1250 utilizes two pole mounted antennas. If there is another track adjacent to the scale track, pole mounted antennas could present a personnel safety hazard to train crew members while performing some switching activities. A minimum of 22 feet between the scale track and the adjacent track centerlines is required to use a Model 1250 Railcar Identification system. If there is no adjacent track, the Model 1250 will be the correct choice. If there is less than 22 feet between track centerlines, the Model 1225 Railcar Identification system would utilize one or two ground mounted antennas (depending on how many adjacent tracks). The ground mounted antennas can be mounted in between the rail ties of the adjacent track (see drawing). The ground mounted antennas, mounted between the ties do not present a safety hazard to switching crews.