Same as the early BR Mark Ones, when the coaches were fitted with dynamos. On low speed routes such as the Kyle Line or West Highland Mallaig extension that could not always put sufficient charge in the batteries.
Just to push back a bit on what you said in response to Maik, but making no statement on the 218 since I'm not familiar with it. Füllstoss varies between locomotives. A great example is the Vectron where it varies even within the same locomotive! On some locomotives (or the Vectron in most region selections) Füllstoss will just connect the main reservoir to the brake pipe and fill it nearly up to 10 bar (sometimes there is a limiting valve to prevent such a high overcharging, sometimes there isn't) while in the German region selection on the Vectron it works as Maik described it: it only fills the brake pipe quickly up to 5 bar.
Most modern brake valves are restricting the "füllstoss" to 5 - 5.3 bar, indeed depends on the type of loco. On older Brake valves the Reservoir (Hauptluftbehälterleitung) was connected into the Brakepipe by pushing the spring forced valve lever forwartd, but on the modern FBV, this is usually initiated with the drivers lever electronicly, switching a valve to change the a2 to a bigger hole. Also On older valves like the 155 / 218, technically you could overcharge the system to a degree, where the Angleicher has no chance to equalize it down to 5bar anymore. Means you need to manually vent the chambers of the brakesystem on the loco and wagons and recharge from scratch. There is no physicsl damage, but you will loose time. Such rare cases of massive overcharging also happened when it was managed to "force couple?" the 10bar reservoir hose to the 5 bar brake pipe.
aaah! I was wondering why the indicators are so dim lol thanks a ton for explaining this good to know so more modern term would be sth like power supply, got it heh I was wondering why it doesnt let me select B ... notch 1 is then what? I sometimes use it when powering down like letting the loco sit in notch 1 for a second or two before going onto 0 and starting to brake good info, now I understand a bit more so once I fill the transmission in notch 2, I can pretty much then fly to notch 7 and then 8 and so on, right ? aaand probably a dumb question, but... Heizung is always turned on? from your responses it sounds like in passenger operation yes, but also in freight? if yes, then... what are those notches 3-7 for then ? for shunting?
We're not talking about modern fly-by-wire locos here, but the 218 and its Knorr D2/D5 mechanical FBV. It was a response to the false assumption that the Füllstoss would only speed up charging the HLL to 5 bar, which was wrong. It works differently in real life (the shown 110 has the same equipment except for electrodynamic instead of hydrodynamic brake, but we've agreed that it's not that important for TSW, as it's not really needed and would probably confuse players). I think the large majority of TSW players do not have any technical background and don't need "Expert-Level" locos.
I agree with maik, that probably many casual players ending up with a stuck train if those functions in the D2/D5 FBV valve would be fully implemented.
