From the definitions page, there are a few more abbreviations / acronyms not mentioned as explained by Gordon. Here's the information form the page in plain text.
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Abbreviation ? ?Name ? ?Notes
AD? ? Audible Detector ? ?CSX generic term for any talking detector; specific functions not listed until later timetables
DED ? ?Dragging Equipment Detector ? ?
DEDAC ? ?Dragging Equipment Detector w/ Axle Count ? ?DED with axle count ability - not all DEDs had transducers to count axles.
EHD ? ?Excessive Height Detector ? ?NS term for High Car Detector
FED ? ?Failed Equipment Detector ? ?BN/MRL generic term for any talking detector
HBD ? ?Hotbox Detector ? ?
HCD ? ?High Car Detector ? ?
HWD ? ?Hot Wheel Detector ? ?
PDD ? ?Plug Door Detector/Portruding Door Detector ? ?
SAD ? ?Stand Alone Detector ? ?NS term for Hotbox Detector that is not connected to their back office network
SED ? ?Stand Alone Dragging Equipment Detector ? ?NS term for Dragging Equipment Detector
SSD ? ?Stress State Detector ? ?NS term for a combined Wheel Impact Load Detector/Load Imbalance Detector site
TSA ? ?Track Side Analyzer ? ?NS term for Hotbox Detector
WID ? ?Wheel Impact Detector ? ?Another term for Wheel Impact Load Detector
WILD ? ?Wheel Impact Load Detector ? ?
WLD ? ?Wide Load Detector ? ?
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Grateful Fred
Sugar Ridge Tower MP40 CC&P
Fred Hilgenberg