# RYDM > RYDM is rail yard fuel control: tanks, meters, nozzles and AEI tag reads at locomotive fueling facilities, on the controls and equipment already in the yard. Installed and field-serviced by CWI Railroad System Specialists. ## Pages - [Home](https://rydm.com/): RYDM is rail yard fuel control: tanks, meters, nozzles and AEI tag reads at locomotive fueling facilities, on the controls and equipment already in the yard. - [Platform](https://rydm.com/platform): What RYDM monitors at a locomotive fueling facility: unloading and bill-of-lading variance, tank and DEF levels, meters and nozzles, AEI tag reads, leaks and derails, and reports. - [How it works](https://rydm.com/how-it-works): RYDM reads the PLCs and instruments already on a fueling pad, collects the data at each yard, and turns it into reports, alerts and postings for each railroad. - [Field service](https://rydm.com/field-service): RYDM is installed and field-serviced by CWI Railroad System Specialists: yard survey, installation, calibration and service after go-live. - [Security](https://rydm.com/security): How access to RYDM data is set up, and how to report a security issue. - [Contact](https://rydm.com/contact): Tell us about your fueling facilities and we will follow up, and where it helps arrange a walkthrough of your yard. - [Privacy notice](https://rydm.com/privacy): What rydm.com collects, why, and how long it is kept. - [Terms of use](https://rydm.com/terms): Terms for using the rydm.com website. ## More - [Full site text](https://rydm.com/llms-full.txt): every page summary, the six platform stages and the common questions in one file.