Report Track Gauge for style sheet reports

Can anyone tell me how to report what the track gauge is set to in BRT when reporting using the station offset report style sheets? I have created a new style sheet but I cant figure out how to report what the track gauge is set to for reporting offsets. Because BRT uses the centre line to report to, I need to subtract the actual track gauge from this to get the 6' dimension between tracks. As we use 1432 &1435 its not just a case of subtracting a value, I would like to automate in possible.

Any suggestions or help would be greatly appreciated