English term (edited): point clip/point clamp/point lock/switch point lock

قفل لمفتاح التفريعة
رابط/ماسك/قماط/ملزمة مفتاح التحويلة

points = مفتاح تحويلة/نقطة تحويل =switch
points = switch (in network rail engineering)

"A switch (points) consist of a pair of linked tapering rails, known as points (switch rails or point blades), lying between the diverging outer rails (the stock rails). These points can be moved laterally into one of two positions to direct a train coming from the point blades toward the straight path or the diverging path. A train moving from the narrow end toward the point blades (i.e. it will be directed to one of the two paths, depending on the position of the points) is said to be executing a facing-point movement.
Unless the switch is locked,"
https://en.wikipedia.org/wiki/Railroad_switch


قفل المبدلات او قفل التحويلات
إغلاق نقطة؛ قفل المُبَدِّلَات [النقل] point lock
https://www.almaany.com/ar/dict/ar-en/point-lock/

"THE CLAMP/LOCK HAVE BEEN LOOKING FOR! LOCKABLE FULLY ADJUSTABLE A ruggedly constructed switch-point locking device designed for all standard rail sizes.(85# to 140# rail sections) These clamps are available for all styles of switches. For use temporarily or permanently on sidings or track sections designated for maintenance or non-use. Provides protection against accidental switch opening "
https://rrtools.com/product/switch-point-clamp/

"In the United Kingdom, FPLs were common from an early date, due to laws being passed which forced the provision of FPLs for any routes traveled by passenger trains – it was, and still is, illegal for a passenger train to make a facing move over points without them being locked, either by a point lock, or temporarily clamped in one position or "
https://en.wikipedia.org/wiki/Railroad_switch

مفتاح التحويلة
"ومنحنيات وتحويلات إلى حدٍ ما كما في السكة الحديد النموذجية ..................
ولكن لا يزال خط السكة الحديد المَفْصِلِيّ مُستخدَمًا في دولٍ عديدة في خطوط السكك الحديدية الأقل سرعة وفي التحويلات، ........
كما في نهاية الجسور الطويلة يُشكِّل مفتاح التحويلة "
https://ar.wikipedia.org/wiki/خط_سكة_حديد


"I've still got a point clip on here on 648 points"
مازال امامي قفل واحد هنا على الرقم 648
مازال امامي قفل واحد هنا على المفتاح رقم 648
مازال امامي قفل واحد هنا على النقطتي رقم 648

648 is the number of those two points i.e the number of the switch at that place.

"normal" in this context = standard = straight = not reverse position = الوضع الطبيعي/القياسي/المستقيم/الغير عكسي
"so they're gonna stay in normal (position) "
لذلك سيبقون على الوضع الطبيعي
لذلك سيبقيان على الوضع الطبيعي
لذلك سيبقى المفتاح على الوضع الطبيعي

First, have a look at the following video to have an idea what a point clip look like and how it functions:

https://vimeo.com/547453035



عند القيام بالصيانة للسكك الحديدية يتم تحويل مسار لسكة باستخدام (تحويلة) ومن أجل ذلك تستخدم أداة التثبيت لتثبيت
التحويلة
........................................................................................................
what does "point" in this context mean?
Points are movable sections of track at a certain position, and for each position there is a number.

Reference:

Points are movable sections of track, allowing trains to move from one line to another.





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Note added at 21 hrs (2021-08-14 18:04:12 GMT)
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https://www.networkrail.co.uk/running-the-railway/looking-af...