This is a topic that comes up for discussion from time to time, so I thought it might be useful to have a thread to refer to rather than rehashing the arguments over again.
When new stock is introduced there are basically four options as to what to do with the old:
Reuse
This is the simplest option - cascade the stock to another route or another operator pretty much as-is. Examples of this include the 319s going to Northern or the 170s going from Scotrail to Southern.
Pros: Lowest cost, fastest option.
Cons: May not be suitable for the new route/operator and can result in non-standard fleets (e.g. the 170s that came from Hull Trains to Scotrail had buffet counters)
Repurpose
Similar to the reuse option, it means that the stock continues to be used however it is modified between lives. This can be relatively minor (e.g. reforming units or converting two-class to single class) or major (e.g. adding power doors to Mk3 carriages).
Pros: The stock is best suited to the new route/operator with a consistent fleet. Gives the ROSCO a chance to improve the stock - e.g. bringing non-compliant stock up to modern standards.
Cons: Most expensive option. Can result in significant downtime.
Reserve
Place the stock into storage awaiting future reuse or repurposing. Examples include the 442s and other stored stock around the network.
Pros: Provides a ready reserve of stock that can be put into use at short notice.
Cons: Storage doesn't come for free, and even in the best case there will be deterioration of the condition of the stock over time.
Recycle
Conversion of the stock into spare parts and scrap metal.
Pros: Well, at least the metal has value.
Cons: No chance to make further money from the stock
Different fleets have suffered different fates over time, and not everyone has agreed with the choices made. The classic example is the Class 373s which are facing recycling whereas the GW HSTs are being repurposed. Many posters have decried the loss of 'perfectly good units' in the former case, and others are bemoaning the fact that Scotland is getting '40-year old English cast offs'. The reality is that ROSCOs try options in order and only get to scrapping if there's no viable plan for reuse or repurpose and no prospects on the horizon that make storing the stock a good idea. They'll only recycle as a last resort - either because the stock isn't suited to be reused or it will cost too much to repurpose it.
In the case of the 373s they couldn't be reused as-is (due to gauge-clearance, electrical supply and signalling issues) and would have been too expensive to repurpose, compared to the Mk3s which needed a relatively low-cost rebuild to bring them up to standard so that they could continue to be used on routes that they're already used on.
When new stock is introduced there are basically four options as to what to do with the old:
Reuse
This is the simplest option - cascade the stock to another route or another operator pretty much as-is. Examples of this include the 319s going to Northern or the 170s going from Scotrail to Southern.
Pros: Lowest cost, fastest option.
Cons: May not be suitable for the new route/operator and can result in non-standard fleets (e.g. the 170s that came from Hull Trains to Scotrail had buffet counters)
Repurpose
Similar to the reuse option, it means that the stock continues to be used however it is modified between lives. This can be relatively minor (e.g. reforming units or converting two-class to single class) or major (e.g. adding power doors to Mk3 carriages).
Pros: The stock is best suited to the new route/operator with a consistent fleet. Gives the ROSCO a chance to improve the stock - e.g. bringing non-compliant stock up to modern standards.
Cons: Most expensive option. Can result in significant downtime.
Reserve
Place the stock into storage awaiting future reuse or repurposing. Examples include the 442s and other stored stock around the network.
Pros: Provides a ready reserve of stock that can be put into use at short notice.
Cons: Storage doesn't come for free, and even in the best case there will be deterioration of the condition of the stock over time.
Recycle
Conversion of the stock into spare parts and scrap metal.
Pros: Well, at least the metal has value.
Cons: No chance to make further money from the stock
Different fleets have suffered different fates over time, and not everyone has agreed with the choices made. The classic example is the Class 373s which are facing recycling whereas the GW HSTs are being repurposed. Many posters have decried the loss of 'perfectly good units' in the former case, and others are bemoaning the fact that Scotland is getting '40-year old English cast offs'. The reality is that ROSCOs try options in order and only get to scrapping if there's no viable plan for reuse or repurpose and no prospects on the horizon that make storing the stock a good idea. They'll only recycle as a last resort - either because the stock isn't suited to be reused or it will cost too much to repurpose it.
In the case of the 373s they couldn't be reused as-is (due to gauge-clearance, electrical supply and signalling issues) and would have been too expensive to repurpose, compared to the Mk3s which needed a relatively low-cost rebuild to bring them up to standard so that they could continue to be used on routes that they're already used on.
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