Can I use my track spikes to train on hard surfaces such as cement?

If the track clip is heating up, you have high resistance at the point the clips fits or in the rail joints themselves. Undo all the track joints and spray them with electrical switch cleaner. Clean the upper rail surface with a green pot scourer as that is where the train gets its power.

https://www.google.com/search?q=electrical+switch+and+contact+cleaner

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There is a short description about both-
Cement paint is water based paint and is applied to either exterior or interior including brick work and concrete.
Texture Paint, which may be manipulated by brush, trowel or other to give various patterns.

Changing from running in regular workout shoes to track spikes can cause Achilles tendon problems. Your Achilles tendon, sometimes called the calcaneal tendon, connects your calf muscles to your heel bone. A slow onset of pain that increases with exertion is likely to be tendonitis, whereas a sudden pain may be a partial or complete Achilles' tendon rupture. Achilles' tendons injuries are slow to heel and, in the case of ruptures, can even require surgery.

Source: http://www.livestrong.com/article/356226-track-spikes-sports-injuries/

Place the spike key over the top of the spike, ensuring that you secure it around the base. Hold the shoe firmly and slowly turn the key to the left to loosen and remove the spike. One you get the spike turning, it should come out easily.

Track spikes can be made from ceramic, metal and plastic and they are screwed into the bottom of the training shoes.

Track spike are similar to cleats and serve a similar purpose however spikes tent to be smaller and have a pointy edge.

There is a setting to use that sets for using either sticks or by hands. If a single pad is thee problem, likely the sensor has come loose. Most of these use a piezo disc pickup and this may have separated from the pad. Open unit carefully and check for this visually. If separated, try to analyze what type adhesive was used. It is likely a contact cement. If so, clean surfaces of residue and use contact cement following the direction. Let dry overnight per the label on the cement. Be careful of the cables in the unit when opening. Keep track of which screws go where. They sometimes have different lengths and threads.

This is a common problem with FasTrack Remotes and Manual switches. It is relative to where the center roller pickup is in relation to the wheels (common connection to outter track rails). Solution is to put electrical tape on the outter rail that forms a V between the turn in and the straight away. This elliminates about 1.5" of track discontinuity. It also eliminates wheel sparking that pits the surface of the outter rail. Wish I had a better solution short of taking the switch apart and doing some rewiring.

I had the same problem with two of our three engines. I read somewhere that you can get them running by hitting the side of the engine against a hard surface. I can't believe it... IT WORKED! I guess the motor gets **** and hitting it will get it going. All three engines are working now.

On these fax machines the most component that gets the most usage are the feed rolls.
Even though they are hard to find and hard to reach, using a flashlight one can view the surface of the feed wheels. By inspecting the surface, they may appear to be shinny instead of the normal feed wheel surface tracks.

Either the wheels need to be replaced or cleaning the surface might get a little reliablity, eventually they may need to be replaced.

Some feed wheels have a lower or they might be on the upper part of the drive train, where they have a square rubber pad.

This is especially true with document feeders, the most common part that wears out.

These pads or, arm tips wear out and need to be replaced.
I hope this helps out.