From Wikipedia.

Terminology:

AB (АБ) - auto blocking (maintains gap between trains)
ALS (АЛС) - automatic locomotive signaling
ARS (АРС) - automatic speed regulation
BPSN (БПСН) - auxiliary power supply
BENTz (БЭНЦ) - low voltage power supply
VRN (ВРН) - air distributor pressure line
DM (ДМ) - door (pneumatic) line
KKL (ККЛ) - Kurenivsko-Krasnoarmeyskaya Line (Krasnoarmeyskaya = Red Army)
KGU (UKSPS) (КГУ (УКСПС)) - dimension control device (detects protrusions below the train)
KR (КР) - contact rail (third rail)
KRZD (КРЗД) - reserve (emergency) door close button
KRU (КРУ) - reserve (emergency) controller
KT (КТ) - brake control
LSD (ЛСД) - doors closed indicator lamp
LKVD (ЛКВД) - engine shutdown (indicator) lamp
MK (МК) - motorized compressor
NM (НМ) - pressure line (train line)
OM (ОМ) - United Workshops
OCh (ОЧ) - no frequency (no ARS signal)
PB (ПБ) - safety (attention) pedal
PVS (ПВС) - emergency rail services
PVL - Podolsko-Voskresenskaya Line (Voskresenskaya = Resurrection)
PST (ПСТ) - full service braking
PTO (ПТО) - maintenance point (area)
PTE (ПТЭ) - technical operation regulations
RD (РД) - pressure switches
RP (РП) - overload relays
RZ (РЦ) - track circuit (detects trains)
STP (СТП) - Combined step-down substation (power substation for rail and consumers)
SSV (ССВ) - line connection branch (switch between lines)
TM (ТМ) - brake line
TZ (ТЦ) - brake cylinder
TCh (ТЧ) - repair depot (literally - "Pulling Part (depot)")
TChM (ТЧМ) - repair depot driver
TChMI (ТЧМИ) - repair depot driving instructor
UKPT (УКПТ) - control device [rooms/closets] in the tunnels
EKK (ЭКК) - electrical box
EPK (ЭПК) - electro-pneumatic valve (electrically actuated pneumatic valve)
EPT (ЭПТ) - electro-pneumatic brake
ET (ЭТ) - emergency braking
VUD (ВУД) - door control switch
PUAV (ПУАВ) - onboard automatic driving device (autodrive)
BPS (БПС) - anti-rolling block (system)
VAD (ВАД) - emergency door switch

Thank you for translation PixelFelon. Now I know what those expressions mean. Maybe those expressions will help me in the future