Some Infernum Tech Weapons 

Standard Tanks: http://preview.turbosquid.com/Preview/2014/07/11__09_44_50/MINITANK2_vray01.png68212e6c-41cb-4e61-b750-c3e08a272ae8Original.jpg

https://img.ifcdn.com/images/030c4f23cd10261e3e30a71072fdcbb8b71f860819a4efaa09751f09a0d46f87_1.jpg

https://cdn.thingiverse.com/renders/d0/be/79/2a/5f/disel_preview_featured.jpg

Heavy Tanks: https://s-media-cache-ak0.pinimg.com/736x/84/bc/dd/84bcddca4fe2f03f1e929f43840d50b9.jpg

Super Heavy Tanks: http://1.bp.blogspot.com/-aBI9YZWqB3U/Vi3NDEuZH8I/AAAAAAAAJZg/81JclbL6_I4/s1600/DieselpunkBolo_zps7973f679.jpg

Specialty Tanks: http://www.ottens.co.uk/gatehouse/wp-content/uploads/2012/08/Red-Alert-3-Tesla-tank.jpg

Light Walkers: https://static.squarespace.com/static/51b3dc8ee4b051b96ceb10de/51ce6099e4b0d911b4489b79/51ce6191e4b0d911b449892b/1361043610063/1000w/430701.jpeg

http://images4.wikia.nocookie.net/__cb20130616012214/slycooperfanfic/images/e/e9/Offensive-Dieselpunk.jpg

Heavy Walkers: http://67.media.tumblr.com/tumblr_likl1m2Flv1qethsqo1_500.jpg 

http://culture.pl/sites/default/files/images/imported/sztuki%20wizualne/portrety/Rozalski_Jakub_/jakub-rozalski-1920-kosciuszko-01-small.jpg

Other Walkers: https://s-media-cache-ak0.pinimg.com/564x/33/d7/7e/33d77eb16d25846950ddd07f3392d2e6.jpg

Artillery: https://saracens.files.wordpress.com/2010/03/giant_wwii_weapon_01.jpg

http://static1.squarespace.com/static/4f5d096c24aca44061edfaf4/t/550b3202e4b0e28c34388ffc/1426797095782/

http://m9.i.pbase.com/v3/31/67831/2/47860219.SlideShow0046.jpg

Aircraft: http://i1202.photobucket.com/albums/bb362/Ashtonbltr/Dieselpunk/goodguy-s.jpg

http://dieselpunksencyclopedia.files.wordpress.com/2012/09/sky-battle-by-waldemar-kazak-2008.jpg

Airships: http://api.ning.com/files/AXbW-YFjzwsJAnHzj*lLLCDbnDAkOJO0Ituwq9KbDJu2H2GikD*PG8ej71*RlvwzdNu5XPT9Z2RVU-2*4byhWb8nigZLUHEZ/we5yergegregrerg.jpg

Soldier Weapons and Armor: https://s-media-cache-ak0.pinimg.com/564x/18/b6/a7/18b6a7ad1b638ae56c864cbde62a1f62.jpg

https://s-media-cache-ak0.pinimg.com/236x/77/92/d9/7792d906a00de3a8f3711c0681c78998.jpg

https://s-media-cache-ak0.pinimg.com/236x/06/68/c0/0668c0023488b09f090947bddb6cd6d9.jpg

http://orig05.deviantart.net/f873/f/2015/277/7/7/the_panzersoeldner___light_up_dieselpunk_armor_by_twohornsunited-d9byt5a.jpg

Other: 

Floating City Sized Fortress: http://fc03.deviantart.net/fs70/i/2011/123/e/2/new_floating_city_wip_3_by_tlbklaus-d3fjdcm.jpg

Edit: Mentioning [@thewizardguy] 

Edit 2: http://static.giantbomb.com/uploads/original/0/1818/1721239-radiant_historia.jpg