Yes, any G-Scale track will work with your set.  I would highly recommend that you do buy different track eventually.  Bachmann track can NOT be used outside.  The track is tubular steel and will rust through within a year.  Other than that, welcome to G-Scale!

If you are checking voltage, it should not matter which lead you use.  The only difference will be that your readout will show the voltage as a negative.  If you see that, either switch your leads or just ignore the negative.

!!Spoiler!!

How many Thomases are out there?  This a rough estimate: 1 Standard Operating (aka Strasburg), 1-2 Narrow non-operating, and 4-5 Standard non-operating.

Do they travel? Yes, they come in by a low-boy trailer pulled by a semi-truck.

Are they all operating like Strasburg?  Sadly, no.

There are several key, cardinal rules when working with your customers.  It's critical that you exhibit proper etiquette in working with customers if you expect them to remain your customers.  To do so, consider these proven tactics in exhibiting true customer-care etiquette.

Be friendly.  Friendliness is easy to exercise in your daily routine, yet difficult to find in today's fast-paced, selfish society.  Your friendliness could be the difference in keeping a distraught or frustrated customer from moving on to work with your competition.
Be honest.  If your customer has a problem that you are unsure how to fix, tell them.  "Under-promise; over-deliver" is the mantra exercised in the best sales and customer service teams all over the world.  If your customers have questions that you can answer, answer honestly, even if it may not be the answer the customer wants to hear.  Honesty is always your best tactic for effective customer service, as the customer will appreciate your honesty and will continue to work with you as a result.
Be thorough.  Take copious notes and follow through on all that you can do to help your customer with their issues.  Make sure your customer knows you are aware of their issues—repeat back what they have told you to ensure they know that you heard them.  Then, put together a game plan that resolves their concerns quickly and effectively.  Share the game plan with your customers, and make sure you do everything you say you will do as outlined on the game plan.
Follow Up.  Once you have solved a customer's problem, make sure you follow through afterward to ensure your customer is not just satisfied, but is thoroughly happy with the results of your actions.  Using the game plan to follow up with your customers will demonstrate a strong commitment to excellence.
Be professional.  While you do want to be friendly, remember that you are conducting business.  It is important to remain professional and objective in all you do and say with your customers.  Professionalism is a lost art in dealing with customers, so the better you are in handling your customers professionally, honestly, and ethically, the more likely you will be to maintain lifelong customer relationships.
Overall, if you want to keep your customers happy and loyal to your company and its brands, it is imperative that you exude excellence in customer service.  Putting in place all of these tactics will ensure your customers are happier and more loyal than they may be today.

Now, is that really that hard to do?

http://www.thomasandfriends.com/usa/parents/dowt.html

By definition Uintah #50 and #51 are not Mallets.  Neither are the UP Big Boys or Challanger locomotives as they are compounds. The very general term "Mallet" is railfan slang to help ease identification.

Technically Uintah #50 and #51 are not a mallet, they are just an articulated locomotive.  A mallet is a compound locomotive that uses steam twice, first in high pressure cylinders and then in lower pressure cylinders. Uintah #50 and #51 used high pressure steam in all four cylinders.  So, technically speaking, Baldwin did not build any 3-foot gauge mallets.

What locomotive/set do you have?

I wish Bachmann would make a 2-6-6-2 logging mallet.  A GE E33 would be cool.  If either are made, I would a couple.

Ah, the good old extended knuckles.  There are no G-Scale manufactures that make them (that I know of), but I am sure someone has done one by now....  I have looked into doing a couple myself, but lack of money and tools is holding the project back....  If I ever get around to actually building one, I will post photos.  Hopefully, someone else has made one and will post photos......

Thanks Timothy!  This is what I was looking for.

I have recently aquired a Bachmann Union Pacific Dash 8-40CW #9404.  My question to all of you is what DCC decoder am I to put into the locomotive, or does it already have a DCC decoder?  I have never worked with DCC as I am a G-Scaler with onboard battery RCS.

Also, are there any precautions I should take with this locomotive?

Thanks!

The speed of a model locomotive is contolled by various things.  Here is a simple "check" list for you locomotives:
Amount of voltage - No, since both locomotive are getting the same amount of voltage.
Type of motor - Maybe, the motor on the 4-4-0 might have a higher rpm than the 4-8-2's motor.
Gear Ratio - Maybe, if the gears on one locomotive has a different ratio then the other locomotive, then one of them will run faster than the other.

Yup. That was quick.

The only two that I know of are owned by the Escanaba & Lake Superior Railroad.  They are ex- New York Central #3805 and #3816.  Both are currently in Delaware & Hudson paint and numbered #1205 (NYC #3805) and #1216 (NYC #3816).