If you have the kids with you to help find this one you might want to park at the listed coords and they can have a swing when you get back. If you do park there you will have a pleasant 1.6km walk.
There are also several other caches in the vicinity you might want to look for while you are in the area.
If you don’t want to use the park you can park a bit closer to WP1, but you will need to get the answers to questions 1 and 2 before you set out:
WP1
Q1:AAA + 86 = The number of the locomotive that Cyril Ellis could not stop on Christmas Eve.
Q2: BBB + 12= The last 3 digits of the year it happened.
S36° 54.AAA E174° 54.BBB
You can check your answers for this puzzle on Geochecker.com.
WP2
Who you gonna call? NOT Ghostbusters!!
Q3: CCC + 64 = The last 3 digits of the number you call if you have a high voltage problem.
Q4: DDD = The last 3 digits of the serial number for the box + 334
S36° 54.CCC E174° 54.DDD
WP3
This is the final point you will need.
Q5: EEE = The first 3 digits of the year this was built + 501.
Q6: FF + 34 = The last 2 digits in the reference number.
S36° 54.EEE E174° 54.8FF
Gosford 02 is a small Marmite jar. You will need to bring something to write on the log.