Class 66 sub classes

[raetiamann]

Could someone please explain the differences between the 66/3 & 66/4 sub classes?

 

[56091]

Could someone please explain the differences between the 66/3 & 66/4 sub classes?

No difference whatsoever. 66/3 was the fastline fleet and 66/4 are the original DRS fleet.

 

[raetiamann]

Thanks.

 

[fgwrich]

No difference whatsoever. 66/3 was the fastline fleet and 66/4 are the original DRS fleet.

Further to this, Fastline operated (and I believe leased) 66301 to 305. It later hired 66434 from DRS who painted it into Fastline livery, only for Jarvis (Fastline's parent company) to enter administration fairly soon after. I'm not sure if 434 even ended up working for Fastline in the end. All are now leased to DRS and painted in their Blue livery.

 

[DB]

Those are, I believe, the low-emissions variant (as opposed t the 66/0s which aren't).

It seems to have been further complicated with GBRF as those are all numbered 667xx but appear to be a mixture of the two types.

 

[43096]

Those are, I believe, the low-emissions variant (as opposed t the 66/0s which aren't).

It seems to have been further complicated with GBRF as those are all numbered 667xx but appear to be a mixture of the two types.

The 66/4s are/were a mixture to, as are the 66/5s.

 

[hwl]

It seems to have been further complicated with GBRF as those are all numbered 667xx but appear to be a mixture of the two types.

7xx - A mix of all three emission types
5xx & 6xx - a mix of 2 emission types

 

[DB]

7xx - A mix of all three emission types
5xx & 6xx - a mix of 2 emission types

Didn't realise there were three variants. What's the third?

 

[hwl]

Didn't realise there were three variants. What's the third?

GBRf, have some EuroIIIa compliant locos (the last ~30 they bought)

 

[soccermad]

666XX are hight tractive effort variants

 

[uww11x]

666* only do 60mph

 

[Wyrleybart]

666* only do 60mph

65mph actually for reasons of pedancy.

== Doublepost prevention - post automatically merged: 25 Sep 2020 ==

The genesis of class 66 was based on the EWS order for 280 of which the last 30 were to be ETS fitted. This was changed to 250 class 66/0 and 30 class 67 using the guts of the last 30 in a new Bo Bo 125mph bodyshell, with ETS.

Freightliner 95 Ltd created a Freightliner Heavy Haul sister company and ordered five 66/5 from EMD. I believe these five were taken from the middle of the EWS build at the London Ontario factory, and I think they were from the series around EWS 66165 ish, obviously with the balance supplied "back to" EWS. I guess the builder numbers would confirm this from the EMD JT42CWR classifications.

The EWS fleet had a couple of changes incorporated into the design as they were being built, and most subsequently retrofitted. Turbo oil priming pipework from 66200 IIRC ? subsequently retro fitted. For a while a fitted needed to manually lube the turbo if the loco was shut down for more than 48 hours.

EWS decided on autocouplers for the new Thrall wagon fleet so newbuild 66/0 and 67 were factory fitted with swinghead buckeyes, and 66003 onwards retro fitted. 001 and 002 have different underfloor framing so were unable to be fitted.

Further batches of Freightliner 66 were ordered, and changes were made to light clusters and side window frames. DRS then ordered 66401-66420 which were basically 66/0s but with the up to current mods etc. Then Freightliner and DRS were able to order the low emissions variants. DRS subsequently replaced their fleet of 401-420 with the low emissions "five door" type, and released their /4s to the "pre owned" market. A complicated history saw some of these pass through Colas and Advenza, with the balance eventually joining the Freightliner fleet.

That is part one !!!!

 

[pdeaves]

That is part one !!!!

Gosh, having read all that I wonder if any two locomotives are actually the same, and if any bare any resemblance to what was actually built!

 

[43096]

Freightliner 95 Ltd created a Freightliner Heavy Haul sister company and ordered five 66/5 from EMD. I believe these five were taken from the middle of the EWS build at the London Ontario factory, and I think they were from the series around EWS 66165 ish, obviously with the balance supplied "back to" EWS. I guess the builder numbers would confirm this from the EMD JT42CWR classifications.

The first five Freightliner 66s (501-505) were nothing to do with Heavy Haul: they were ordered for the Intermodal business. The first Heavy Haul business locos were 506-520, ordered to support a contract to provide haulage for Railtrack engineering services.

 

[Wyrleybart]

The first five Freightliner 66s (501-505) were nothing to do with Heavy Haul: they were ordered for the Intermodal business. The first Heavy Haul business locos were 506-520, ordered to support a contract to provide haulage for Railtrack engineering services.

I stand corrected. Thank you