All locos are fitted with DCC decoders, with control being the free open-source software JMRI DeCoder- Pro with a SPROG 3 module providing interface to the track. Mobile phone and an Android tablet running the free software Engine Driver, being used as throttles with Wi-Fi connection to DeCoder Pro. I have also fitted a DIY Stay-Alive circuit to the decoders. Commercial modules are available, but these tend to be far too large for N-Gauge steam locos, and cost as much as the more expensive decoders. These commercial modules use high value Super-Caps and can keep a loco running for several seconds over isolated sections of track. In practise all that is really required is to keep the decoder and loco alive over short dead areas at points or small sections of dirty track, especially with short wheel base shunting locos, where it is all too easy for some wheels to lose contact with the track if the loco rocks at all as it crosses a point. There are several designs of DIY Stay-Alive modules which have been published on the Internet. I have used a version of these using surface mount 220uF Tantalum Capacitors which are rated at 16v DC,
several being wired in parallel, together with a surface mount 100R charge limiting resistor and a surface mount bi- pass diode.  A very informative article on DIY Stay-Alive is by Nigel Cliffe. Some decoders e.g. the Lenze Gold and ESU LokPilot V4, have convenient pads to which you can solder the added circuit, other decoders require much more delicate soldering to connect to the internal DC voltage of the decoder. Note this connection is not the track connection. You do need a very fine solder tip on a good temperature controller iron - so only attempt this if you have suitable experience - the decoder warranty may well be voided if you get it wrong ! Depending on how many capacitors you can fit, usually these have to go into the cab, with modern coreless motors you get about a quarter to half a second of running over dead track; OK - nothing like the commercial Stay-Alive modules, but enough to make a worthwhile difference. Once the capacitors are painted with matt black and suitably placed crew added then they are not at all obvious. I have not had the courage yet to try weathering the locos, so they are all in ex-works condition - for now!
 Ivatt 2-6-2 Tank Engine  1200
The Ivatt 2-6-2 tank loco is by Dapol. It was quite a good runner but did hesitate on some of my points on Archie’s Yard, particularly on the double slip, and often needed a poke to get it going from rest. I managed to fit five capacitors onto the floor of the cab with a Lenz Gold Mini decoder tucked into the roof. This loco now runs like a dream - no hesitation at creep speeds and starts straight away. I did also add 5 grm of lead into the top of the boiler space (the capacitors also added a useful 3 grms) increasing the total weight from 44grms to 52grms. This loco pulls eight coaches plus a couple of wagons with additional load of 75 grams up a 3% slope; with only slight wheel slip if you accelerate it hard.
The standard big-lump-of-plastic couplings have been replaced with DG couplings, with hook, latch and loop. This allows uncoupling by pushing slowly over small cylindrical rare-earth magnets, hidden beneath the sleepers. The latch enables you to keep pushing the wagon till it is at the required point, and then to pull away leaving the wagon in place. Pulling wagons over the magnets does not uncouple them.
These photos show the capacitors and decoder in the cab area of the loco. I did need to fettle the inside of the body moulding a little bit to get the circuit to fit. You can see the resistor & bi-pass diode on the left hand photo. Ideally I should have used wire colours other than red/black for the extra circuit. Once the capacitors are painted matt black and train crew are added then they are not at all obvious.
LMS Royal Scot Class 4-6-0 - Scots Guardsman  6115 Diesel Shunter Class 08 0-6-0  13029
This is fitted with an ESU Lokpilot micro V4 encoder, and a stay-alive circuit with six 220uF capacitors in the cab area. It pulls eight coaches up a 3% slope, with some wheel slip. The wheel slip was cured by replacing the standard “coal load” with one made from lead, gave enough additional traction as the driving motor is is the tender. The creep speed is excellent - 8 minutes to travel a metre, with no hesitation on points.
Photos to follow.
This is actually an early BR shunter, but the LMS did experiment with this type just prior to nationalisation. Strictly I should re- badge and renumber this loco to fit the period of the layout - even so I don’t think any were used in the Yorkshire Dales area. But it is superb in operation; fitted with an ESU Lokpilot micro V4 decoder and a stay-alive circuit, it will crawl at 8 minutes to travel a metre, with no hesitation. The model is quite a reasonable weight, so pulls a long train of wagons up a 3% slope, no problem. On a test it hauled 8 coaches plus 2 wagons with extra load 75 grams up the 3% slope on the layout. On my test rig it hauled 4 wagons loaded with a total of 151 grams up a 3% slope. At 5% slope it managed 95 grams in 3 wagons.
Photos to follow.
Fowler Class 4F 0-6-0  3851
This is a excellent model with detailed cab area. Electrical pickups are on all loco and tender wheels, so it runs well on the flat. However the motor is in the loco and because of the design of the boiler in this class there is little room for any added weight. It managed to pull 2 wagons with 40 grams of added load up the 3% slope on the layout, but could not manage 75 grams due to wheel slippage because of lack of traction with the rails - the motor is powerful enough. Being disappointed with its lack of traction I did some research and decided to try a jar of Bullfrog Snot ( see www.bullfrogsnot.com ), although American it is available in the UK. This is a green goo that you apply to drive wheels, which cures overnight to a nearly invisible traction tyre. It needs a bit of water adding to get the right degree of fluidity for N-Gauge wheels. Applying the goo to the four rear wheels of the loco and trying it on my test rig, the loco now manages 179 grams in 5 wagons on the 3% slope and 116 grams in 3 wagons on the 5% slope. A very impressive boost to performance. The only down side is some loss of electrical contact due to 4 wheels on the loco now being effectively insulated from the track, but there was plenty of room in the tender for eight 220uF stay-alive capacitors, so the loss of wheel contact has not proved to be a problem.
Photos to follow.
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